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Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear

One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issu...

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Autores principales: Podaril, Martin, Prášil, Tomáš, Majernik, Jan, Kampf, Rudolf, Socha, Ladislav, Gryc, Karel, Gráf, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321326/
https://www.ncbi.nlm.nih.gov/pubmed/35888391
http://dx.doi.org/10.3390/ma15144924
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author Podaril, Martin
Prášil, Tomáš
Majernik, Jan
Kampf, Rudolf
Socha, Ladislav
Gryc, Karel
Gráf, Martin
author_facet Podaril, Martin
Prášil, Tomáš
Majernik, Jan
Kampf, Rudolf
Socha, Ladislav
Gryc, Karel
Gráf, Martin
author_sort Podaril, Martin
collection PubMed
description One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issue of reducing the melt gasification by using FDU (Foundry Degassing Unit) unit. The gas content in the melt is evaluated by determining the Dichte Index depending on the geometry and the degree of the FDU unit rotor wear. For experiments performed under the operating conditions, three types of graphite rotors with different geometries are used. The extent of melt gasification and the Dichte Index are monitored during the rotor wear, at a rate of 0%, 25%, 50%, 75% and 100% rotor wear. Secondly, the chemical composition of the melt is monitored depending on the design and wear of the rotor. It is proven that the design and the degree of rotor wear do not have significant effect on the chemical composition of the melt and all evaluated samples fell within the prescribed quality in accordance with EN 1706. With regard to the overall comparison of the geometry and wear of individual rotor types, it has been proven that, in terms of efficiency, the individual rotors are mutually equivalent and meet the requirements for melt degassing throughout the service life.
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spelling pubmed-93213262022-07-27 Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear Podaril, Martin Prášil, Tomáš Majernik, Jan Kampf, Rudolf Socha, Ladislav Gryc, Karel Gráf, Martin Materials (Basel) Article One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issue of reducing the melt gasification by using FDU (Foundry Degassing Unit) unit. The gas content in the melt is evaluated by determining the Dichte Index depending on the geometry and the degree of the FDU unit rotor wear. For experiments performed under the operating conditions, three types of graphite rotors with different geometries are used. The extent of melt gasification and the Dichte Index are monitored during the rotor wear, at a rate of 0%, 25%, 50%, 75% and 100% rotor wear. Secondly, the chemical composition of the melt is monitored depending on the design and wear of the rotor. It is proven that the design and the degree of rotor wear do not have significant effect on the chemical composition of the melt and all evaluated samples fell within the prescribed quality in accordance with EN 1706. With regard to the overall comparison of the geometry and wear of individual rotor types, it has been proven that, in terms of efficiency, the individual rotors are mutually equivalent and meet the requirements for melt degassing throughout the service life. MDPI 2022-07-15 /pmc/articles/PMC9321326/ /pubmed/35888391 http://dx.doi.org/10.3390/ma15144924 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Podaril, Martin
Prášil, Tomáš
Majernik, Jan
Kampf, Rudolf
Socha, Ladislav
Gryc, Karel
Gráf, Martin
Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
title Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
title_full Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
title_fullStr Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
title_full_unstemmed Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
title_short Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
title_sort aluminum melt degassing process evaluation depending on the design and the degree of the fdu unit graphite rotor wear
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321326/
https://www.ncbi.nlm.nih.gov/pubmed/35888391
http://dx.doi.org/10.3390/ma15144924
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